Retention and stability of complete dentures Flashcards
1
Q
Definition of retention?
A
- Resistance of a denture to vertical movement (displacement forces) away from tissues
2
Q
Definition of stability?
A
- Resistance of a denture to displacement (by functional forces) in a horizontal direction
3
Q
What are some examples of displacing forces?
A
- Gravity
- Muscle activity
- Sticky foods
- Function
4
Q
What is adhesion?
A
- The physical attraction of unlike molecules for each other
- Saliva and mucous membrane
- Saliva and denture base
- Maxillary vs mandibular
- Extension over denture bearing area
5
Q
What is cohesion?
A
- Physical attraction between similar molecules
- Salivary film
6
Q
Why is atmospheric pressure needed?
A
- Important of border seal
7
Q
What areas are important for seal of fitting surface for maxillary denture?
A
- Post dam seal
- Adequate extension into retromylohyoid fossa (lingual pouch)
8
Q
What factors make retention and stability difficult?
A
- Atrophic ridges
- Patients with an incomplete palate e.g. congenital cleft
- Pts with soft tissue that is mobile e.g. fibrous ridge
- Damaged alveolar ridge
- Gunshot wound resulting in resection and skin graft
- Mobile soft tissue e.g. free flap
- Pt who can’t tolerate base extension e.g. gagging
- Insufficient saliva e.g. salivary gland disease
9
Q
What are some aids to denture retention and stability?
A
- Denture adhesives
- Linings
- ## Titanium
